package com.jy.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.jy.reggie.dto.DishDto;
import com.jy.reggie.entity.Category;
import com.jy.reggie.entity.Dish;
import com.jy.reggie.entity.DishFlavor;
import com.jy.reggie.mapper.DishMapper;
import com.jy.reggie.service.CategoryService;
import com.jy.reggie.service.DishFlavorService;
import com.jy.reggie.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;


@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private DishService dishService;

    @Autowired
    private CategoryService categoryService;

    /**
     * 新增菜品，同时保存对应的口味数据
     * @param dishDto
     */
    @Override
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品的基本信息到菜品表dish
        this.save(dishDto);

        //保存菜品口味数据到菜品口味表dish_flavor
        Long dishId = dishDto.getId();

        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }


    /**
     * 获取菜品分页，并显示菜品分类名（因为Dish只有categoryId，没有categoryName）
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @Override
    public Page pagePlus(int page, int pageSize, String name) {
        //分页构造器
        Page<Dish> pageInfo = new Page<>(page,pageSize);
        Page<DishDto> dishDtoPage = new Page<>();
        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加条件
        queryWrapper.like(name!=null,Dish::getName,name);
        queryWrapper.orderByDesc(Dish::getUpdateTime);
        //执行分页查询
        dishService.page(pageInfo,queryWrapper);
        //对象拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");
        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item)->{
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);
            Long categoryId = item.getCategoryId();
            Category category = categoryService.getById(categoryId);
            if(category!=null){
                dishDto.setCategoryName(category.getName());
            }
            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);

        return dishDtoPage;
    }



    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @Override
    public DishDto getByIdWithFlavor(Long id) {
//        查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);

//        查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.eq(DishFlavor::getDishId,dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);

//        拷贝数据到DishDto
        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish,dishDto);
        dishDto.setFlavors(flavors);
        return dishDto;
    }


    /**
     * 更新菜品消息，同时更新口味信息
     * @param dishDto
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
//        更新dish表基本信息
        this.updateById(dishDto);
//        清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dishDto.getId());
        dishFlavorService.remove(queryWrapper);
//        添加当前提交过来的口味数据---dish_flavor表的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors.forEach(f->f.setDishId(dishDto.getId()));
        dishFlavorService.saveBatch(flavors);
    }


    /**
     * 删除菜品信息和对应的口味信息
     * @param ids
     */
    @Override
    public void deleteWithFlavor(List<Long> ids) {
        this.removeByIds(ids);
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(DishFlavor::getDishId,ids);
        dishFlavorService.remove(queryWrapper);
    }
}
